Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

From: Avi Kivity
Date: Tue Jan 19 2010 - 03:08:26 EST

On 01/19/2010 12:15 AM, Jim Keniston wrote:

I don't like the idea but if the performance benefits are real (are
Based on what seems to be the closest thing to an apples-to-apples
comparison -- counting the number of calls to a specified function --
uprobes is 6-7 times faster than the ptrace-based equivalent, ltrace -c.
And of course, uprobes provides much, much more flexibility, appears to
scale better, and works with multithreaded apps.

Likewise, FWIW, utrace is more than 10x faster than strace -c in
counting system calls.

This is still with a kernel entry, yes? Do you have plans for a variant that's completely in userspace?

error compiling committee.c: too many arguments to function

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